Power Bank, also known as external battery pack, external back-up battery, external battery charger, portable battery charger, power bank battery, power bank charger, portable power bank and some company even give it a personalized name “phone lover”. And now with the convenience of power bank, you can go almost with a diversity of digital products without taking too much extra battery, just one power bank will solve the problem.

Nowadays people tend to carry many portable electronic products such as laptops, tablet PCs, mobile phones, digital cameras, camcorders and so on just to enjoy the fun the tech brings to us. However, they are all powered by one battery, whether big capacity or small, and mostly the battery capacity it own takes can’t  meet our use of the digital devices. When taking a business trip or on travel with these devices during peak hours, like when the phone is on the phone, using digital cameras to take pictures, playing PSP video game , etc.,


if the battery has no power , you will feel very hopeless and helpless, and most importantly you can not take for each device with a backup battery, needless to say you have to spend a lot of money to buy a device’s backup battery. Therefore, in order to solve thse annoying problems, through continuous research and exploration, and the industry finally developed a new products: power bank. With a couple of tips, you can almost charge any devices you want. Now the largest single capacity of one power bank can be up to 14000mAh.


  • Built-in backup rechargeable battery for powering up your cell phone and tablet when you can’t find a power outlet.
  • Provides a convenient mobile power source for your device.
  • High-capacity rechargeable lithium batteries for increased energy efficiency.
  • Built-in IC chip to prevent overcharging and short circuit.
  • Can be recharged from a USB-powered port or a wall outlet.
  • LED indicator.
  • Built-in LED flashlight.
  • Great for traveling, outages, emergencies, backup and other occasions.
  • Compact and easy-to-carry.
  • Comes with a travel adapter, 2 adapter cables, and 7 connectors for different cell phone models.


Power bank, this device become more popular this day, usually smartphone owner put this device in theirshopping list long with main device.

The restless smartphone make battery run dry faster than smartphone with normal usage. Using battery that have bigger power maybe is a solution, but it have other consequences. Battery that have more power have bigger dimensions mean you need to change the rear cover. For some other phone that have unremoable battery, change battery option is impossible to be done .

Today, power bank have many design and capacities. There some mistake when choosing a powerbank. But using powerbank still the best option than change the battery.

Recharge from powerbank to device is very simple, user only need connect device to powerbank than it will automatically recharge the phone battery.

Things that you should know about powerbank

  1. Numbers atpowerbank
    In power bank the number are indicate from total battery cell capacity. More cell means more power that can be save and ready for backup your device.
    How many time power bank can recharge the device is depend on power bank capacity. If you have power bank with 12.000 doesn’t mean you can recharge 2000 mAH battery for 6 times. Some electricity will lost due the conversion and recharge.

Power bank have 3.7 volt for device recharge and 5 volt for recharge it’s own battery. This is the conversion formula

(power bank capacity x power bank voltage) : needed voltage

as an example, power bank with 8.800
(12.000 x 3.7) : 5=8.880

if we calculate the loss power at recharge is 10%, then 8.800 minus 10% and we got 7.992

so, we got a conclusion that power bank with 12.000 mAh only have 7.992 mAh capacity. Each time the powerbank recharge the device need 2.000 mAh, then with 12.000 mAh power bank only can recharge for 4 times with assumption the last one will not got 2.000 mAh

  1. Powerbank plug
    Usually we saw there 2 port inpowerbank ,1A and 2A. This number show how much power that will use for recharge troughs that port. A means ampere.
    the power that will use for charging will determine how long it take full full recharge.
    As an illustration, Samsung Galaxy III have 2.100 mAh battery then it recharge from 1A output port, it will took around 2 hours for fill the battery.

Using 2A is not quarantine that the recharge time will cut for half. Some device have power restriction that can use for recharge. But in support device , it will cut time to half.

3.the battery (power storage)
For power storage, power bank using battery.There is two type

  1. Li-Polymer battery
    This kind of battery usually have 2500 Mah. The old model power bank using this battery. This type have bulky body.
  2. Li-Ion battery
    Power bank that using lithium battery have slight body. Lithium battery have minimum capacity 8.000 mAh.

Be smart buyer

The power capacity If you want buy old type powerbank, you should know that maximum battery that can used for power storage is 3. If each battery have 2.500 Mah than the maximum number that we get is 7.500 Mah.

for power bank that using lithium battery,16.000 Mah is a rational number and still make a sense. For full charge the power bank that have 16.000 Mah need at least 12 hours. In normal condition, it could stand for a week.

Fake power bank

Price cannot use as standard. Some power bank give expensive price and say those device have more power than other. But after you using it, you feel that it could backup your device that it should be. Fake power bank could not give the power that they say..